Synthesis and characterisation of metal ion-imprinted polymers for separation of selective rare earth elements

Ion imprinted polymers (IIPs) have received much attention in diverse fields owing to their high selectivity for targeted metal ions. In the present study, lanthanide-ion imprinted polymers (L-IIPs) were synthesised by dissolving stoichiometric amounts of lanthanum ion and selected complexing agents...

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Main Author:	Nik Rohani, Nik Mustapa
Format:	Thesis
Language:	English
Published:	2018
Subjects:	Q Science (General) T Technology (General)
Online Access:	http://umpir.ump.edu.my/id/eprint/24766/1/Synthesis%20and%20characterisation%20of%20metal%20ion-imprinted%20polymers%20for%20separation%20of%20selective%20rare%20earth%20elements.pdf
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spelling	my-ump-ir.247662021-11-10T00:05:57Z Synthesis and characterisation of metal ion-imprinted polymers for separation of selective rare earth elements 2018-02 Nik Rohani, Nik Mustapa Q Science (General) T Technology (General) Ion imprinted polymers (IIPs) have received much attention in diverse fields owing to their high selectivity for targeted metal ions. In the present study, lanthanide-ion imprinted polymers (L-IIPs) were synthesised by dissolving stoichiometric amounts of lanthanum ion and selected complexing agents either Schiff bases, azobenzene base ligands and also indole compounds with solvent in the presence of cross-linking agent (ethylene glycol dimethacrylate (EGDMA)), functional monomer (4-vinylpyridine), and initiator (2,2-azobisisobutyronitrile (AIBN)). The cavities in the polymer materials corresponding to the specific lanthanide ions were created by leaching the polymer using aqueous HCl solution after polymerization. The complete removal of the lanthanide ions from the L-IIPs were confirmed by ICP-MS, FESEM and solid state analysis by UV-vis NIR spectroscopy. FTIR study confirmed the complexation between the L-IIPs and lanthanide ions through the nitrogen, hydroxyl oxygen and sulphur of Schiff base, azobenzene base ligands and indole compounds. At optimum (pH 6), the maximum sorption capacity achieved by the L-IIPs are estimated to be La-IIP-Schiff (25.0 mg g-1), La-IIP-Azo (24.3 mg g-1), Ce-IIP-Schiff (24.5 mg g-1), Ce-IIP-Azo (24.7 mg g-1), Pr-IIP-Schiff (125.3 mg g-1), Nd-IIP-Schiff (126.5 mg g-1), Sm-IIP-Schiff (127.6 mg g-1), Eu-IIP-Schiff (128.2 mg g-1) and Gd-IIP-Schiff (129.1 mg g-1). In the selectivity study, the L-IIPs were found to show good selectivity to the praseodymium, gadolinium, europium, samarium, cerium, neodymium and lanthanum ion in the presence of coexisting cation, promethium. It was found that imprinting results increased the affinity of the material toward several lanthanide ions over other competitor metal ions with the same charge and similar ionic radii. The synthesized L-IIPs were repeatedly used and regenerated for 8 times without a significant decrease in polymer binding affinity. 2018-02 Thesis http://umpir.ump.edu.my/id/eprint/24766/ http://umpir.ump.edu.my/id/eprint/24766/1/Synthesis%20and%20characterisation%20of%20metal%20ion-imprinted%20polymers%20for%20separation%20of%20selective%20rare%20earth%20elements.pdf pdf en public masters Universiti Malaysia Pahang Faculty of Industrial Sciences and Technology
institution	Universiti Malaysia Pahang Al-Sultan Abdullah
collection	UMPSA Institutional Repository
language	English
topic	Q Science (General) T Technology (General)
spellingShingle	Q Science (General) T Technology (General) Nik Rohani, Nik Mustapa Synthesis and characterisation of metal ion-imprinted polymers for separation of selective rare earth elements
description	Ion imprinted polymers (IIPs) have received much attention in diverse fields owing to their high selectivity for targeted metal ions. In the present study, lanthanide-ion imprinted polymers (L-IIPs) were synthesised by dissolving stoichiometric amounts of lanthanum ion and selected complexing agents either Schiff bases, azobenzene base ligands and also indole compounds with solvent in the presence of cross-linking agent (ethylene glycol dimethacrylate (EGDMA)), functional monomer (4-vinylpyridine), and initiator (2,2-azobisisobutyronitrile (AIBN)). The cavities in the polymer materials corresponding to the specific lanthanide ions were created by leaching the polymer using aqueous HCl solution after polymerization. The complete removal of the lanthanide ions from the L-IIPs were confirmed by ICP-MS, FESEM and solid state analysis by UV-vis NIR spectroscopy. FTIR study confirmed the complexation between the L-IIPs and lanthanide ions through the nitrogen, hydroxyl oxygen and sulphur of Schiff base, azobenzene base ligands and indole compounds. At optimum (pH 6), the maximum sorption capacity achieved by the L-IIPs are estimated to be La-IIP-Schiff (25.0 mg g-1), La-IIP-Azo (24.3 mg g-1), Ce-IIP-Schiff (24.5 mg g-1), Ce-IIP-Azo (24.7 mg g-1), Pr-IIP-Schiff (125.3 mg g-1), Nd-IIP-Schiff (126.5 mg g-1), Sm-IIP-Schiff (127.6 mg g-1), Eu-IIP-Schiff (128.2 mg g-1) and Gd-IIP-Schiff (129.1 mg g-1). In the selectivity study, the L-IIPs were found to show good selectivity to the praseodymium, gadolinium, europium, samarium, cerium, neodymium and lanthanum ion in the presence of coexisting cation, promethium. It was found that imprinting results increased the affinity of the material toward several lanthanide ions over other competitor metal ions with the same charge and similar ionic radii. The synthesized L-IIPs were repeatedly used and regenerated for 8 times without a significant decrease in polymer binding affinity.
format	Thesis
qualification_level	Master's degree
author	Nik Rohani, Nik Mustapa
author_facet	Nik Rohani, Nik Mustapa
author_sort	Nik Rohani, Nik Mustapa
title	Synthesis and characterisation of metal ion-imprinted polymers for separation of selective rare earth elements
title_short	Synthesis and characterisation of metal ion-imprinted polymers for separation of selective rare earth elements
title_full	Synthesis and characterisation of metal ion-imprinted polymers for separation of selective rare earth elements
title_fullStr	Synthesis and characterisation of metal ion-imprinted polymers for separation of selective rare earth elements
title_full_unstemmed	Synthesis and characterisation of metal ion-imprinted polymers for separation of selective rare earth elements
title_sort	synthesis and characterisation of metal ion-imprinted polymers for separation of selective rare earth elements
granting_institution	Universiti Malaysia Pahang
granting_department	Faculty of Industrial Sciences and Technology
publishDate	2018
url	http://umpir.ump.edu.my/id/eprint/24766/1/Synthesis%20and%20characterisation%20of%20metal%20ion-imprinted%20polymers%20for%20separation%20of%20selective%20rare%20earth%20elements.pdf
_version_	1783732079406612480

Synthesis and characterisation of metal ion-imprinted polymers for separation of selective rare earth elements

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